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[PATCH] sundance: fix DFE-580TX Tx Underrun 

Under heavy PCI bus load, ports of the DFE-580TX 4-ethernet port board stop
working, with currently no other cure than a powercycle.  Here is a tested
fix.  By the way, I also fixed some references and attribution.

Signed-off-by: Philippe De Muyter <phdm@macqel.be>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>
This commit is contained in:
Philippe De Muyter 2005-10-28 12:23:47 +02:00 committed by Jeff Garzik
parent 89358f90ab
commit b71b95efa5
1 changed files with 48 additions and 14 deletions
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62
drivers/net/sundance.c
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@ -80,7 +80,7 @@
I/O access could affect performance in ARM-based system
- Add Linux software VLAN support
Version LK1.08 (D-Link):
Version LK1.08 (Philippe De Muyter phdm@macqel.be):
- Fix bug of custom mac address
(StationAddr register only accept word write)
@ -91,11 +91,14 @@
Version LK1.09a (ICPlus):
- Add the delay time in reading the contents of EEPROM
Version LK1.10 (Philippe De Muyter phdm@macqel.be):
- Make 'unblock interface after Tx underrun' work
*/
#define DRV_NAME "sundance"
#define DRV_VERSION "1.01+LK1.09a"
#define DRV_RELDATE "10-Jul-2003"
#define DRV_VERSION "1.01+LK1.10"
#define DRV_RELDATE "28-Oct-2005"
/* The user-configurable values.
@ -263,8 +266,10 @@ IV. Notes
IVb. References
The Sundance ST201 datasheet, preliminary version.
http://cesdis.gsfc.nasa.gov/linux/misc/100mbps.html
http://cesdis.gsfc.nasa.gov/linux/misc/NWay.html
The Kendin KS8723 datasheet, preliminary version.
The ICplus IP100 datasheet, preliminary version.
http://www.scyld.com/expert/100mbps.html
http://www.scyld.com/expert/NWay.html
IVc. Errata
@ -500,6 +505,25 @@ static int netdev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
static int netdev_close(struct net_device *dev);
static struct ethtool_ops ethtool_ops;
static void sundance_reset(struct net_device *dev, unsigned long reset_cmd)
{
struct netdev_private *np = netdev_priv(dev);
void __iomem *ioaddr = np->base + ASICCtrl;
int countdown;
/* ST201 documentation states ASICCtrl is a 32bit register */
iowrite32 (reset_cmd | ioread32 (ioaddr), ioaddr);
/* ST201 documentation states reset can take up to 1 ms */
countdown = 10 + 1;
while (ioread32 (ioaddr) & (ResetBusy << 16)) {
if (--countdown == 0) {
printk(KERN_WARNING "%s : reset not completed !!\n", dev->name);
break;
}
udelay(100);
}
}
static int __devinit sundance_probe1 (struct pci_dev *pdev,
const struct pci_device_id *ent)
{
@ -1190,23 +1214,33 @@ static irqreturn_t intr_handler(int irq, void *dev_instance, struct pt_regs *rgs
("%s: Transmit status is %2.2x.\n",
dev->name, tx_status);
if (tx_status & 0x1e) {
if (netif_msg_tx_err(np))
printk("%s: Transmit error status %4.4x.\n",
dev->name, tx_status);
np->stats.tx_errors++;
if (tx_status & 0x10)
np->stats.tx_fifo_errors++;
if (tx_status & 0x08)
np->stats.collisions++;
if (tx_status & 0x04)
np->stats.tx_fifo_errors++;
if (tx_status & 0x02)
np->stats.tx_window_errors++;
/* This reset has not been verified!. */
if (tx_status & 0x10) { /* Reset the Tx. */
np->stats.tx_fifo_errors++;
spin_lock(&np->lock);
reset_tx(dev);
spin_unlock(&np->lock);
/*
** This reset has been verified on
** DFE-580TX boards ! phdm@macqel.be.
*/
if (tx_status & 0x10) { /* TxUnderrun */
unsigned short txthreshold;
txthreshold = ioread16 (ioaddr + TxStartThresh);
/* Restart Tx FIFO and transmitter */
sundance_reset(dev, (NetworkReset|FIFOReset|TxReset) << 16);
iowrite16 (txthreshold, ioaddr + TxStartThresh);
/* No need to reset the Tx pointer here */
}
if (tx_status & 0x1e) /* Restart the Tx. */
iowrite16 (TxEnable,
ioaddr + MACCtrl1);
/* Restart the Tx. */
iowrite16 (TxEnable, ioaddr + MACCtrl1);
}
/* Yup, this is a documentation bug. It cost me *hours*. */
iowrite16 (0, ioaddr + TxStatus);